| anal sac | A vesicular cutaneous invagination opening by a duct on each side of the anal canal in carnivores (best developed in skunks, but absent in some bears, the raccoon, kinkajou, coati, and sea otter), each lying between the external and internal anal sphincter muscles, which aid in emptying the contents. The sac stores odouriferous scent markers produced by glands that line its wall or duct; frequently the sac becomes impacted in the dog or cat, requiring manual emptying. (05 Mar 2000) |
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| anal sacs | Two sacs opening on either side of the anus near the junction of the mucous membrane and skin in carnivores. The glandular lining produces a gray or brown sebaceous secretion having an unpleasant odour. The sac ducts sometimes become occluded and the secretion accumulates. This leads to irritation that the animal attempts to relieve by rubbing its anus along the ground. The sacs may subsequently become infected and abscessed. (12 Dec 1998) |
| anal sinuses | The grooves between the anal columns. Synonym: Morgagni's sinus. Pockets or crypts in the columnar zone of the anal canal between the anocutaneous line and the anorectal line; the sinuses give the mucosa a scalloped appearance. Synonym: sinus anales, anal crypts, Morgagni's crypts, rectal sinuses. (05 Mar 2000) |
| anal sphincter | See: external anal sphincter, internal anal sphincter. (05 Mar 2000) |
| anal triangle | The posterior portion of the perineal region through which the anal canal opens; bounded by a line through both isehial tuberosities, the sacrotuberous ligaments and the coccyx. Synonym: regio analis, anal region. (05 Mar 2000) |
| anal valves | Delicate crescent-shaped mucosal folds that pass between the lower ends of neighboring anal columns; the small pocket thus formed is an anal sinus. Synonym: valvulae anales, Morgagni's valves. (05 Mar 2000) |
| anal verge | The transitional zone between the moist, hairless, modified skin of the anal canal and the perianal skin. (05 Mar 2000) |
| analbuminaemia | Absence of albumin from the serum. Origin: G. An-priv. + albumin + G. Haima, blood (05 Mar 2000) |
| analcime | <chemical> A white or flesh-red mineral, of the zeolite, occurring in isometric crystals. By friction, it acquires a weak electricity; hence its name. Origin: Gr. Priv. + strong, strength: cf. F. Analcime. Source: Websters Dictionary (01 Mar 1998) |
| analemma | 1. <chemistry> An orthographic projection of the sphere on the plane of the meridian, the eye being supposed at an infinite distance, and in the east or west point of the horizon. 2. An instrument of wood or brass, on which this projection of the sphere is made, having a movable horizon or cursor; formerly much used in solving some common astronomical problems. 3. A scale of the sun's declination for each day of the year, drawn across the torrid zone on an artificial terrestrial globe. Origin: L. Analemma a sun dial on a pedestal, showing the latitude and meridian of a place, Gr. A support, or thing supported, a sun dial, fr. To take up; + to take. Source: Websters Dictionary (01 Mar 1998) |
| analepsy | 1. <medicine> Recovery of strength after sickness. 2. <neurology> A species of epileptic attack, originating from gastric disorder. See: Analemma. Origin: Gr. A taking up, or again, recovery, from. Source: Websters Dictionary (01 Mar 1998) |
| analeptic | <pharmacology> A drug which acts as a restorative, such as caffeine, amphetamine, pentylenetetrazol, etc. Origin: Gr. Analepsis = a repairing (18 Nov 1997) |
| analeptic enema | An enema of a pint of lukewarm water with one-half teaspoonful of table salt. (05 Mar 2000) |
| analgesia | A state of insensitivity to pain, even though the subject is fully conscious. (18 Nov 1997) |
| analgesia algera | Spontaneous pain in a body area that lacks sensation. Synonym: analgesia algera. (05 Mar 2000) |